src/app/common/testing/input-fields.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import {ComponentFixture} from '@angular/core/testing';
import {Observable} from 'rxjs/Observable';
import {By} from '@angular/platform-browser';
import {DebugElement} from '@angular/core';

export function setValueByFormControlName(fixture: ComponentFixture<any>, formControlName: string, value: string): Observable<any> {
  const debugElement: DebugElement = fixture.debugElement.query(By.css(`input[formControlName="${formControlName}"]`));

  if (!debugElement) {
    throw new Error(`Could not find debug element for form control name: ${formControlName}`);
  }

  setValue(debugElement, value);

  fixture.detectChanges();
  return Observable.fromPromise(fixture.whenStable());
}

export function setValueByCssSelector(fixture: ComponentFixture<any>, selector: string, value: string): Observable<any> {
  const debugElement: DebugElement = fixture.debugElement.query(By.css(selector));

  if (!debugElement) {
    throw new Error(`Could not find debug element with selector: ${selector}`);
  }

  setValue(debugElement, value);

  fixture.detectChanges();
  return Observable.fromPromise(fixture.whenStable());
}

function setValue(debugElement: DebugElement, value: string): void {
  const inputElement: HTMLInputElement = debugElement.nativeElement;
  inputElement.value = value;
  inputElement.dispatchEvent(new Event('input'));
}